FAA Expands Jet Engine Part Replacement Mandate
Published Date: 6/20/2025
Rule
Summary
If you fly planes with CFM LEAP-1A engines, listen up! The FAA is updating rules to replace some engine parts that might be weaker because of a material problem. This means more parts need swapping out soon to keep flights safe, and operators should expect some costs and deadlines to meet.
Analyzed Economic Effects
3 provisions identified: 0 benefits, 3 costs, 0 mixed.
Required replacement of engine parts
If you operate airplanes with CFM LEAP-1A engines (for example LEAP-1A23, -1A24, -1A26, -1A29, -1A30, -1A32, -1A33, -1A33B2, and -1A35A), the FAA requires replacement of certain high-pressure turbine (HPT) stage 1 disks, forward outer seals, and compressor rotor stages 6–10 spools. The rule keeps the prior replacement requirements in place and applies to those listed engine models.
Expanded parts list for material defect
The FAA expanded the AD to add additional affected parts that were manufactured from material suspected to have reduced material properties due to iron inclusion. That means more parts made from the same suspect material are now subject to the replacement and installation restrictions in this AD.
Prohibition on installing affected parts
The prior AD (2023-09-06) prohibited installing HPT stage 1 disks, forward outer seals, or compressor rotor stages 6–10 spools that have part numbers and serial numbers identified in the service information. This AD retains the prior AD requirements, which continues to prevent installation of those identified parts onto any engine.
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